diff options
| author |   Nicholas Piggin <npiggin@gmail.com> | 2020-04-29 16:56:54 +1000 |
|---|---|---|
| committer |   Michael Ellerman <mpe@ellerman.id.au> | 2020-05-28 23:24:37 +1000 |
| commit | d4539074b0e9c5fa6508e8c33aaf51abc8ff6e91 (patch) | |
| tree | 4f5914349c6615225839c54d5b37fff58f75a96d /arch/powerpc/include | |
| parent | powerpc/64/kuap: Conditionally restore AMR in interrupt exit (diff) | |
| download | linux-dev-d4539074b0e9c5fa6508e8c33aaf51abc8ff6e91.tar.xz linux-dev-d4539074b0e9c5fa6508e8c33aaf51abc8ff6e91.zip | |
powerpc/64s/kuap: Conditionally restore AMR in kuap_restore_amr asm
Similar to the C code change, make the AMR restore conditional on
whether the register has changed.
Signed-off-by: Nicholas Piggin <npiggin@gmail.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/20200429065654.1677541-7-npiggin@gmail.com
Diffstat (limited to 'arch/powerpc/include')
| -rw-r--r-- | arch/powerpc/include/asm/book3s/64/kup-radix.h | 10 |
1 files changed, 7 insertions, 3 deletions
diff --git a/arch/powerpc/include/asm/book3s/64/kup-radix.h b/arch/powerpc/include/asm/book3s/64/kup-radix.h index 820169bac6c4..3ee1ec60be84 100644 --- a/arch/powerpc/include/asm/book3s/64/kup-radix.h +++ b/arch/powerpc/include/asm/book3s/64/kup-radix.h @@ -12,13 +12,17 @@ #ifdef __ASSEMBLY__ -.macro kuap_restore_amr gpr +.macro kuap_restore_amr gpr1, gpr2 #ifdef CONFIG_PPC_KUAP BEGIN_MMU_FTR_SECTION_NESTED(67) - ld \gpr, STACK_REGS_KUAP(r1) + mfspr \gpr1, SPRN_AMR + ld \gpr2, STACK_REGS_KUAP(r1) + cmpd \gpr1, \gpr2 + beq 998f isync - mtspr SPRN_AMR, \gpr + mtspr SPRN_AMR, \gpr2 /* No isync required, see kuap_restore_amr() */ +998: END_MMU_FTR_SECTION_NESTED_IFSET(MMU_FTR_RADIX_KUAP, 67) #endif .endm |